Influence of welding on microstructure and strength of rail steel

Sarikavak, Yasin; Türkbaş, Osman Selim; Çoğun, Can

doi:10.1016/j.conbuildmat.2020.118220

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…A incidência de defeitos e falhas em soldas do tipo aluminotérmica é bem descrito por [17], visto que, durante o processo de soldagem as mudanças microestruturais devido ao gradiente térmico influenciam diretamente nas propriedades mecânicas da região solda, conforme apresentado em [18,19].…”

Section: Caracterização Da Estruturalunclassified

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Miranda¹,

Reis²,

Santos³

et al. 2021

Tecnol. Metal. Mater. Min.

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Publicado pela ABM. Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. a ResumoDentre os defeitos provenientes de fadiga de contato de rolamento (RCF) nos trilhos ferroviários, o spalling se apresenta como um dos mais severos devido às suas características morfológicas. Este trabalho envolve a análise de um amostra de solda aluminotérmica de trilho ferroviário contendo um defeito do tipo spalling, nas caracterizações buscou-se fazer a correlação entre o defeito, a microestrutura e as propriedades mecânicas na região do trilho. Foram realizados ensaios de dureza e microdureza, além da caracterização microestrutural e fractográfica via microscopia óptica. Os resultados mostraram que o spalling possui uma forte tendência em ocorrer na região da Zona Termicamente Afetada (ZTA), expressa pela variação microestrutural e dureza ao longo da amostra e as trincas são influenciadas pela microestrutura deformada da superfície do trilho. Palavras-chave: Defeitos em trilhos; Caracterização; Fadiga de contato de rolamento; Spalling.

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Section: Caracterização Da Estruturalunclassified

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Miranda¹,

Reis²,

Santos³

et al. 2021

Tecnol. Metal. Mater. Min.

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“…1,2 Despite their widespread use, these welding methods often encounter a significant challenge: the weld thermal cycles and subsequent post-weld heat treatment (PWHT) can result in a non-uniform surface hardness zone spanning tens of millimetres. 3 This zone comprises both hardened and softened subzones, 4 leading to mechanical property discrepancies between the joined region and the steel rail itself. 5,6 Additionally, these welded joints are required to withstand the same load of rolling contact fatigue as the high-strength steel rail during their service.…”

Section: Introductionmentioning

confidence: 99%

Quasi-equal strength and toughness matching rail steel joint obtained via friction welding below A_c1 temperature

Zhang,

Li,

Xie

et al. 2024

Science and Technology of Welding and Joining

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U75V rail steel rods underwent continuous-drive friction welding (CDFW). Joint properties were evaluated through microstructural analysis and mechanical testing (tensile, impact, and microhardness). The thermo-mechanical behaviour of the CDFW process was simulated by the finite element method, while a computed continuous cooling transformation diagram was used to predict phase transformation, microstructures, and hardness variations. By reducing the spindle speed to 1000 r/min, the peak temperature in the weld centre zone (WCZ) remained below Ac1. Microstructures in WCZ exhibited a high density of geometrically necessary dislocations. The joints demonstrated comparable tensile strength, impact toughness, and microhardness to BM, with underlying mechanisms elucidated. This study showcases CDFW's potential in achieving rail steel joints with quasi-equal strength and toughness to the BM.

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“…They also may cause weld defects such as flat spot, white spot, slag inclusions, overburn, and other metallurgical problems [11]. Numerous surveys have demonstrated that the rail welded joints are major vulnerable areas in continuously welded rail (CWR) lines [12]. The vast majority of the incidents (e.g., abrasion, low collapse, crack, and even fracture) come from the weld zones, which severely impacts the durability and service life of the entire CWR lines [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of CDFW Process Parameters on Microstructure and Mechanical Properties of U75V Rail Steel Welded Joint

Zhang

Chang-an

Zhu

2022

Metals

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In the present paper, the continuous-drive friction welding (CDFW) technology has been successfully applied to join the U75V rail steel. The base metal (BM) of U75V rail steel is lamellar pearlite, and the weld zone could be clearly divided into three subzones (i.e., heat affected zone, thermo-mechanical affected zone (TMAZ), and central weld zone (CWZ)). Electron back-scattered diffraction examinations revealed the martensitic evolution in TMAZ and CWZ, suggesting that the experienced high temperature, severe plastic deformation, and fast cooling rate induce the microstructure transition during the CDFW process. The hard and brittle martensite structure explains the raised microhardness profiles and the reduced impact absorption energy of the as-welded joints. The CDFW process parameters govern the joint properties via influencing the welding heat input and plastic deformation by spindle speed and friction pressure at the friction stage, and the plastic deformation layer (flash) extrusion by upsetting pressure at the upsetting stage. More favorable results could be obtained at small set values of spindle speed (1800 rpm) and friction pressure (75 MPa) with less heat input and plastic deformation, and a large set value of upsetting pressure (175 MPa) with more flash extrusion, whose tensile strength reached 94.3% of that of the BM.

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Influence of welding on microstructure and strength of rail steel

Cited by 13 publications

References 23 publications

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Quasi-equal strength and toughness matching rail steel joint obtained via friction welding below A_c1 temperature

Influence of CDFW Process Parameters on Microstructure and Mechanical Properties of U75V Rail Steel Welded Joint

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Influence of welding on microstructure and strength of rail steel

Cited by 13 publications

References 23 publications

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Quasi-equal strength and toughness matching rail steel joint obtained via friction welding below Ac1 temperature

Influence of CDFW Process Parameters on Microstructure and Mechanical Properties of U75V Rail Steel Welded Joint

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Product

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Quasi-equal strength and toughness matching rail steel joint obtained via friction welding below A_c1 temperature